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Manipulates HTTP header fields on the request. It can set, add, and delete header values, or perform replacements using regular expressions.


request_header [<matcher>] [[+|-]<field> [<value>|<find>] [<replace>]]
  • <field> is the name of the header field. By default, will overwrite any existing field of the same name. Prefix with + to add the field instead of replace, or prefix with - to remove the field.
  • <value> is the header field value, if adding or setting a field.
  • <find> is the substring or regular expression to search for.
  • <replace> is the replacement value; required if performing a search-and-replace.


Remove the Referer header from the request:

request_header -Referer